Out of the leaves of a tree, one fourth fall in the first week of october. One third of the remainder in the next week and two fifth of those still remaining fall in the third week. There are then 1350 leaves left. How many were there at first?

A woman sells to the first customer half her stock of apples and half an apple, to the second customer half an apple and half of her remaining stock and so also to a third and to a fourth customer. She finds that she has now 15 apples left. How many apples had she at first?

A bookstore sold books worth Rs. 2,85,891 in the first week of June and books worth Rs. 4,00,768 in the next week. How much was the sale in the two weeks together? In which week was the sale greater and by how much?

Find the consecutive largest positive integers such that the sum of one-third of first, one-fourth of second and one-fifth of third is at most 20.

A bus traveling the first one-third distance at a speed of 10 km/h, the next one-fourth at 20- km/h and the remaining at 40 km/h. The average speed of the bus is nearly

A bus traveling the first one-third distance at a speed of 10 km/h, the next one-fourth at 20- km/h and the remaining at 40 km/h. The average speed of the bus is nearly

On the World Environment Day tree plantation programme was arranged on a land which is triangular in shape. Trees are planted such that in the first row there is one tree, in the second row there are two trees, in the third row there are three trees and so on. Then find the total number of trees in 25 rows.